Load Specifications
Load data in caliber 7 mm STW with .284 | 150gr | Berger Classic Hybrid Hunter bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and IMR 7828 SSC.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 59,756 psi | 90% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,536 psi | 85% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,856 psi | 88% | 3068 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 57,334 psi | 86% | 2995 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 59,451 psi | 89% | 3064 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,740 psi | 87% | 3031 fps | 99.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,330 psi | 78% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,464 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,898 psi | 85% | 2986 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 59,698 psi | 89% | 3058 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,595 psi | 86% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,566 psi | 86% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,552 psi | 88% | 3058 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,434 psi | 83% | 3048 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 60,278 psi | 90% | 3018 fps | 98% |
| Bofors RP15 | <<locked>> | 94% | 58,813 psi | 88% | 3041 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 57,406 psi | 86% | 3045 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 59,698 psi | 89% | 3058 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,682 psi | 86% | 2933 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 59,654 psi | 89% | 3058 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,769 psi | 87% | 2986 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 60,017 psi | 90% | 3002 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 58,943 psi | 88% | 2999 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,754 psi | 87% | 2982 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,522 psi | 86% | 2907 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,507 psi | 85% | 3117 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,827 psi | 88% | 3025 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 56% | 1903 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 59,944 psi | 90% | 2976 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,914 psi | 88% | 2953 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,826 psi | 85% | 2927 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 59,335 psi | 89% | 2979 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 57,537 psi | 86% | 3041 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,688 psi | 71% | 2897 fps | 98.3% |
| Lovex S065 | <<locked>> | 84% | 60,046 psi | 90% | 2953 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,552 psi | 88% | 2953 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,377 psi | 86% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,537 psi | 86% | 2979 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 48,486 psi | 73% | 2923 fps | 99.7% |
| Norma MRP | <<locked>> | 90% | 60,046 psi | 90% | 3077 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,450 psi | 88% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 59,059 psi | 89% | 3068 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 57,392 psi | 86% | 2976 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,522 psi | 86% | 2999 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 58% | 1949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,637 psi | 85% | 2956 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 59,146 psi | 89% | 3038 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,682 psi | 86% | 3107 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,855 psi | 85% | 3064 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 58,102 psi | 87% | 2966 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 56,666 psi | 85% | 2976 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 57,682 psi | 86% | 2933 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 60,046 psi | 90% | 2953 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,552 psi | 88% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,263 psi | 89% | 2907 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 60,017 psi | 90% | 3028 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 59,944 psi | 90% | 2959 fps | 99.3% |
| Somchem S365 | <<locked>> | 86% | 59,727 psi | 90% | 2969 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,029 psi | 85% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 60,089 psi | 90% | 2887 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 59,959 psi | 90% | 2959 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,840 psi | 85% | 2927 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 98% | 59,915 psi | 90% | 2999 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 84% | 59,190 psi | 89% | 2963 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 59,538 psi | 89% | 2995 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 59,524 psi | 89% | 3077 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 96% | 60,133 psi | 90% | 3061 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 98% | 57,392 psi | 86% | 3064 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,523 psi | 88% | 3123 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 59,727 psi | 90% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,001 psi | 87% | 2989 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,029 psi | 85% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,058 psi | 86% | 2943 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 39,813 psi | 60% | 2628 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 52,678 psi | 79% | 2881 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 44,121 psi | 66% | 2805 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 43,685 psi | 65% | 2756 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 39,146 psi | 59% | 2687 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 88% | 38,232 psi | 57% | 2661 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 30,458 psi | 46% | 2497 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,372 psi | 76% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,758 psi | 66% | 2753 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,726 psi | 60% | 2697 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,508 psi | 58% | 2654 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,141 psi | 50% | 2569 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,265 psi | 65% | 2812 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 51,329 psi | 77% | 2979 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,864 psi | 75% | 2844 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 36,999 psi | 55% | 2631 fps | 95.9% |
| Bofors RP30 | <<locked>> | 86% | 37,971 psi | 57% | 2677 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 39,726 psi | 60% | 2697 fps | 97% |
| Bofors RP7 | <<locked>> | 80% | 54,201 psi | 81% | 2877 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 36,419 psi | 55% | 2618 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 54,041 psi | 81% | 2930 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 56,173 psi | 84% | 2943 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 41,858 psi | 63% | 2697 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,002 psi | 61% | 2677 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,282 psi | 71% | 2756 fps | 100% |
| Hodgdon Retumbo | 68.1 gr | 82% | 34,708 psi | 52% | 2657 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 54,723 psi | 82% | 2963 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 42% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,400 psi | 74% | 2808 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,419 psi | 83% | 2900 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,821 psi | 75% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,004 psi | 64% | 2690 fps | 96.2% |
| IMR 7828 SSC | 68 gr | 82% | 40,524 psi | 61% | 2730 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,812 psi | 58% | 2713 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 53,127 psi | 80% | 2848 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,561 psi | 77% | 2844 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 34,258 psi | 51% | 2503 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 50,241 psi | 75% | 2858 fps | 99% |
| Norma 217 | <<locked>> | 88% | 31,749 psi | 48% | 2552 fps | 95% |
| Norma MRP | <<locked>> | 80% | 42,076 psi | 63% | 2772 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 51,213 psi | 77% | 2861 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,623 psi | 56% | 2674 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 50,212 psi | 75% | 2861 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,808 psi | 51% | 2549 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 43% | 1745 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,939 psi | 79% | 2900 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,198 psi | 77% | 2920 fps | 100% |
| ReloadSwiss RS 76 | 71.1 gr | 80% | 31,560 psi | 47% | 2559 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 41,843 psi | 63% | 2789 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 44,860 psi | 67% | 2736 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 43,250 psi | 65% | 2740 fps | 98% |
| Rottweil R 907 | <<locked>> | 80% | 54,201 psi | 81% | 2877 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,127 psi | 80% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,561 psi | 77% | 2844 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,895 psi | 78% | 2799 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,917 psi | 64% | 2736 fps | 97.9% |
| Somchem S361 | <<locked>> | 80% | 45,759 psi | 69% | 2723 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 48,617 psi | 73% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,758 psi | 66% | 2720 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 80% | 56,449 psi | 85% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,591 psi | 79% | 2851 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,116 psi | 57% | 2592 fps | 97.1% |
| Vihtavuori N170 | <<locked>> | 96% | 55,999 psi | 84% | 2936 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,880 psi | 78% | 2854 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,873 psi | 64% | 2730 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,930 psi | 63% | 2759 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 39,798 psi | 60% | 2694 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 90% | 42,989 psi | 64% | 2802 fps | 95% |
| Vihtavuori N570 | <<locked>> | 96% | 50,691 psi | 76% | 2986 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,967 psi | 78% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,215 psi | 81% | 2933 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,781 psi | 54% | 2694 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,190 psi | 60% | 2644 fps | 97.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 73 powders for 7 mm STW loaded with the .284 | 150gr | Berger Classic Hybrid Hunter. Vihtavuori N570 delivers the highest muzzle velocity at 3,123 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,123 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Hodgdon Retumbo, ReloadSwiss RS 76, IMR 7828 SSC rank at the top here: for 7 mm STW with the .284 | 150gr | Berger Classic Hybrid Hunter they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.